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Scouring the desert and mountains, wind gathers tiny sand grains and pushes the grains into drifts. Over time, when conditions are favorable, the gathered sand grows into shifting mountains several hundred feet high. In some places in the desert Southwest, vast dune deposits cover miles, taking on a life of their own. They form shapes such as stars or crescents. They even make sounds. All of them whisper as the sand moves, but some squeak or sing and a few actually boom as dry sand cascades from a high crest down the lee side.